Panajota wilhelm hofmann



UNITED STATES PANAJOTA \VILHELM HOFMANN, OF LUDVVIGSHAFEN-ON-THE-RHINE,GER- MANY, ASSIGNOR TO THE GHEMISGHE FABRlK, VORMALS HOFMANN &SOHOETENSACK, OF SAME PLACE.

PROCESS OF MANUFACTURING SALOL.

SPECIFICATION forming part of Letters Patent No. 391,248, dated October16,1888.

Application liled March 19, 1888. Serial No. 267,745. (No specimens.)Patented in Germany August 11, 1886, No. 39,184. and in France AugnstQY,1886, No. 178,191.

To all whom it may concern.-

Be it known that I, PANAJOTA WrLnELM HOFMANN, a subject of the King ofPrussia, residing at Ludwigshafen-outhe-Rhine, in the German Empire,chemist, have invented a new Process of Manufacturing Salol, (for whichI have obtained a patent of the Empire of Germany, No. 39,184, datedAugust 11,1886, and a brevet d invention ofthe Republic of France, No.178,194, dated August 27, 1886,) of which the following is aspecification.

For manufacturing the so'called salol (ether of salicylic acid withphenolsfl proceed as-follows: In a vessel provided with an agitator andcapable of being heated up to 120 to 180 Celsius phenolate of sodium isheated until it has arrived at the proper state of dryness, (dust,) andthereafter phosgen gas is admitted while allowing the agitatorto workata reduced speed. \Vhile maintaining the temperature within theabove-named limits, salicylic acid will soon be formed, whereas one partof the phenolate of sodium is maintained in the mixture unaltered. Thispart under the influence of the phosgen will combine with the salicylicacid into salol, as will be seen by the following equation:

O Na

oi NaCl From the foregoing it is evident that it is not absolutelynecessary to begin with the phenolate of sodium. The manufacture ofsalol will also be the result if salicylate of sodium previouslyproduced is mixed with phenolate of sodium and the mixture is thereafterexposed under the conditions above named to the influence of phosgengas.

YVhat I claim as my invention, and desire to secure by Letters Patent,is

1. As an improvement in the process of manufacturing salol, the heatingof phcnolate ofsodium in an atmosphere ofphosgen gas,substantially asherein described.

2. As an improvement in the process of manufacturing salol,the heatingof a mixture of phenolate of sodium with salicylate of sodium in anatmosphere of phosgen gas, substantially as herein described.

In testimony that I claim the foregoing as my invention I have signed myname in presence of two subscribing witnesses.

PANAJO'IA WlLllELM HOFMANN.

'Witnesses:

ANDRAUS DRAUSMANN, H. E. HAMMOND.

